Gas-engine.



PATENTED JAN. 16, 1906. E. P. PORTER & W. R. WHITING.

GAS ENGINE.

APPLICATION FILED M,AR.16, 1905.

xx w wv UNITED STATES PATENT oEEIoE.

EDWIN F. PORTER AND WALTER R. WHITING, OF BOSTON, MASSACHU- SETTS, ASSIGNORS TO AMERICAN ROTARY- ENGINE COMPANY, OF BOSTON, MASSAOHUSETTS,'A CORPORATION OF MAINE.

GAS-ENGINE.

Specification of Letters Patent.

Patented Jan. 16, 1906.

To all whom, it may concern:

Be it known that we, EDWIN F. PORTER and WALTER R. WHITING, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Gas-Engines, of which the folowing is a specification.

This invention has relation to gas-engines, so called, of the type illustrated in the copending application of Porter and Whiting, Serial No. 37,615, filed November 24, 1901. In the engine set forth in said application the piston is connected to two oppositely-rotating crank-shafts by separate pitmen, provision being made for gearing the said crank-shafts together to insure their synchronous rotation in opposite directions. In the construction of such engines it has been found that there is a tendency of the itmen to twist the piston and cause it to bind in the c linder. This is sometimes due to the play etween the gears which connect the crank-shafts, to the wearing away of the crank-pins or pitmen, or to inequalities in the length of the two pitmen. According to this present invention, how ever, we provide a loose connection between the block to which the pitmen are pivoted and the piston to compensate for inequalities in the length of the pitmen and to prevent the piston from binding in the cylinder.

On the drawings, Figure 1 represents, partially in section, a gas-engine equipped with our improvements. Fig. 2 shows In detail the loose connection between the pitmanblock and the piston." Fig. 3 represents a somewhat different embodiment of the invention.

On the drawings the cylinder is indicated at a and the piston at b.

The two crank-shafts are indicated at c c, and they are geared together by suitable ears d d. As set forth in the application ereinbefore referred to, the two crank-shafts are provided with momentumewheels, the two wheels, h0wever,'bein mounted u on theopposite ends of the sha ts to which t ey are attached.

e 0 indicate pitmen, which are preferably of the same length and which are straight, as shown. Each pitman is pivoted upon a stud j; passed through the ears g of a pitmanblock 9 The two studs ff are parallel, as

shown in Fig. 1. The pitman-block is pivotall connected to the cylinder by a intle' g. he pistonis preferablyhollow, as s own,

and the pitman-block is located therein, be-

- ing adapted to slide to a limited extent longitudinally u on the pintle g, upon which it 1s pivoted. he extent to which the pitmanblock is adapted to move, however, is limited by annular flan es 1) -formed on the interior or walls of the piston.

By virtue of this construction there is a universal movement between the pitman and the piston, and consequently there is no possibility of twisting or forcing the piston out of true with the interior walls of thecylinder or causing it to bind or become cramped therein.

It is evident that in lieu of the particular arrangement shown in Figs. 1 and 2 the construction shown in Fig. 3 may be employed, in which the pintle h, which corresponds to that at g, may be located in parallelism with the studs f f of the pintle-block.

It is'desirable to employ the two so arate studs f f in connection with the straig t pitmen 0 rather than to connect the two pitmen with the pitman-block by a sin le stud, for in that event the. pitmen woul have to be offset andunder the strains experienced in an engine of this character would be liable to become bent or broken'or at least to yield under the strain.

Having thus explained, the nature of the invention and described a way of constructing and using the same, althou h without attempting to set forth all of the orms In which it may be made or all of the modes of its use, we declare that what we claim is- 1. In combination with a cylinder, a iston, two oppositely-rotating crank-shafts, and two pitmen connected to said crankshafts, of means interposed between said itmen and piston for loosely connecting the ormer to t e latter to provide lost motion between the said parts.

2. The combination with a cylinder, a piston, two oppositely-rotating crank-shafts, a pitman connected to each crank-shaft, a pitman-block having separate studs or pivots for the pitman, and means for loosely connectin said pitman-block to said piston.

3. file combination with a cylinder, a piston, oppositely-rotating crank-shafts, a sep- 'arate pitman for each crank-shaft, a pitmanblock having se arate studs or pivots for each pitman, an a pintle loosely connecting said pitman-block with said piston.

4. The combination with a cylinder; a piston, oppositely-rotating crank-shafts, pitmen connecting said crank-shafts to a member which is loosely mounted on and adapted to chan e its relative position with said piston.

.5. he combination with a cylinder, a piston, oppositely-rotating crank-shafts, pitmen connecting said crank-shafts to a member which is loosely mounted on and adapted to change its relative position with said piston and accommodate itself to any unequal nio- 5 tion of said pitmen.

In testimony whereof we have afliXed our signatures in presence of two witnesses.

EDWIN F. PORTER. WALTER R. WHITI NG.

Witnesses:

M. B. MAY, C. C. STEGHER. 

